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 #include &quot;connectionwidget.h&quot;

 #include &lt;QtGui&gt;
 #include &lt;QtSql&gt;

 ConnectionWidget::ConnectionWidget(QWidget *parent)
     : QWidget(parent)
 {
     QVBoxLayout *layout = new QVBoxLayout(this);
     tree = new QTreeWidget(this);
     tree-&gt;setObjectName(QLatin1String(&quot;tree&quot;));
     tree-&gt;setHeaderLabels(QStringList(tr(&quot;database&quot;)));
     tree-&gt;header()-&gt;setResizeMode(QHeaderView::Stretch);
     QAction *refreshAction = new QAction(tr(&quot;Refresh&quot;), tree);
     metaDataAction = new QAction(tr(&quot;Show Schema&quot;), tree);
     connect(refreshAction, SIGNAL(triggered()), SLOT(refresh()));
     connect(metaDataAction, SIGNAL(triggered()), SLOT(showMetaData()));
     tree-&gt;addAction(refreshAction);
     tree-&gt;addAction(metaDataAction);
     tree-&gt;setContextMenuPolicy(Qt::ActionsContextMenu);

     layout-&gt;addWidget(tree);

     QMetaObject::connectSlotsByName(this);
 }

 ConnectionWidget::~ConnectionWidget()
 {
 }

 static QString qDBCaption(const QSqlDatabase &amp;db)
 {
     QString nm = db.driverName();
     nm.append(QLatin1Char(':'));
     if (!db.userName().isEmpty())
         nm.append(db.userName()).append(QLatin1Char('@'));
     nm.append(db.databaseName());
     return nm;
 }

 void ConnectionWidget::refresh()
 {
     tree-&gt;clear();
     QStringList connectionNames = QSqlDatabase::connectionNames();

     bool gotActiveDb = false;
     for (int i = 0; i &lt; connectionNames.count(); ++i) {
         QTreeWidgetItem *root = new QTreeWidgetItem(tree);
         QSqlDatabase db = QSqlDatabase::database(connectionNames.at(i), false);
         root-&gt;setText(0, qDBCaption(db));
         if (connectionNames.at(i) == activeDb) {
             gotActiveDb = true;
             setActive(root);
         }
         if (db.isOpen()) {
             QStringList tables = db.tables();
             for (int t = 0; t &lt; tables.count(); ++t) {
                 QTreeWidgetItem *table = new QTreeWidgetItem(root);
                 table-&gt;setText(0, tables.at(t));
             }
         }
     }
     if (!gotActiveDb) {
         activeDb = connectionNames.value(0);
         setActive(tree-&gt;topLevelItem(0));
     }

     tree-&gt;doItemsLayout(); <span class="comment">//</span> HACK
 }

 QSqlDatabase ConnectionWidget::currentDatabase() const
 {
     return QSqlDatabase::database(activeDb);
 }

 static void qSetBold(QTreeWidgetItem *item, bool bold)
 {
     QFont font = item-&gt;font(0);
     font.setBold(bold);
     item-&gt;setFont(0, font);
 }

 void ConnectionWidget::setActive(QTreeWidgetItem *item)
 {
     for (int i = 0; i &lt; tree-&gt;topLevelItemCount(); ++i) {
         if (tree-&gt;topLevelItem(i)-&gt;font(0).bold())
             qSetBold(tree-&gt;topLevelItem(i), false);
     }

     if (!item)
         return;

     qSetBold(item, true);
     activeDb = QSqlDatabase::connectionNames().value(tree-&gt;indexOfTopLevelItem(item));
 }

 void ConnectionWidget::on_tree_itemActivated(QTreeWidgetItem *item, int <span class="comment">/* column */</span>)
 {

     if (!item)
         return;

     if (!item-&gt;parent()) {
         setActive(item);
     } else {
         setActive(item-&gt;parent());
         emit tableActivated(item-&gt;text(0));
     }
 }

 void ConnectionWidget::showMetaData()
 {
     QTreeWidgetItem *cItem = tree-&gt;currentItem();
     if (!cItem || !cItem-&gt;parent())
         return;
     setActive(cItem-&gt;parent());
     emit metaDataRequested(cItem-&gt;text(0));
 }

 void ConnectionWidget::on_tree_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *)
 {
     metaDataAction-&gt;setEnabled(current &amp;&amp; current-&gt;parent());
 }</pre>
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